Question

Which equation represents a circle with a center at (–3, –5) and a radius of 6 units?

(x – 3)2 + (y – 5)2 = 6
(x – 3)2 + (y – 5)2 = 36
(x + 3)2 + (y + 5)2 = 6
(x + 3)2 + (y + 5)2 = 36

Answer 1

Use (x − h)^2 + (y − k)^2 = r^2 with (h,k)=(-3,-5), r=6:

(x + 3)^2 + (y + 5)^2 = 36